E.+Calculating+Ability+Achievement+Discrepancies+Between+the+Wechsler+Intelligence+Scale+for+Children



= Frequently, professionals calculate discrepancies between two measures using a point-difference criterion, such as a difference of 15 or 22 points. This practice is based on an assumption that 15 points represents one standard deviation and 22 points represents 1.5 standard deviations. However, the standard deviation of the discrepancy score distribution is not the same as the standard deviation of either individual measure. It is the standard error of the estimate 2 (SEE), not the standard deviation of the WISC-III or the WJ III ACH, that should be used to determine the significance of a discrepancy (Pedhazur, 1997). =

The ASB4 Explains Correlations to other ability test such as Wechsler